3171C

SB-10010841-2220
File in Section:
Service Bulletin
Bulletin No.:
Date:
PIC3171E
March, 2013
PRELIMINARY INFORMATION
Subject:
Unwanted Stabilitrak Activation
Models:
2005-2006 Cadillac STS
This PI was superseded to update recommended field. Please discard PIC3171D.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some customers may have a concern of unwanted Stabilitrak activation and/or a "STABILITY SYS ACTIVE"
message on the DIC when turning. Possible DTC C0252 or C0710.
Recommendation/Instructions
Park the vehicle with the front wheels facing forward.
Use the Tech 2 and monitor the Steering Wheel Position Sensor Phase A and Phase B parameters under
VSES data.
Phase A should read approximately 2.5V and Phase B should read approximately 0V If the SWPS reads incorrectly,
the Technician will need to inspect the lower steering column bearing for damage.
From the engine compartment, push inward on the upper portion of the steering shaft (towards the steering wheel).
The shaft should not move. If movement is noted, replace the steering column assembly or install a steering column
kit (and transfer parts as needed). If no movement is noted, continue diagnosing using the appropriate procedure
in SI.
Warranty Information
The correction for this concern may be one of several repairs described above. For vehicles repaired under warranty,
please use the appropriate warranty labor operation based on the actual cause and repair.
ADDITIONAL SI KEYWORDS:
ABS apply brake EBCM EBTCM
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.